Category: Castables Refractory

one of the monolithic refractory materials, easy to transport and more convenient for construction.

Casting Refractory Cement

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Refractory castables are made of refractory cement (10%~15%, weight ratio) and refractory aggregates, so casting refractory cement is also an indispensable part.

The Role of Casting Refractory Cement

The role of casting refractory cement in refractory castables is the binder. It affects the setting time of the refractory castable. At the same time, due to the nature of the castable refractory cement itself, it also causes a series of performance degradation of the refractory castable.

Casting Refractory Cement
Casting Refractory Cement

Main Properties of Castable Refractory  Cement and Its Effect on Refractory Castables

  1. In order to completely hydrate the cement, excessive addition of water (10%~15%) is required to cause the ceramic refractory castable to have a high porosity and a decrease in density.
  2. Calcium aluminate hydrate has strong dehydration and recrystallization effects in the middle temperature stage, which destroys the microstructure of the hard spots in the castable, and the strength of the refractory castables drops sharply in the middle temperature stage.
  3. The cementitious binder brings more calcium into the castable, which leads to a decrease in the load-softening temperature of the ceramified refractory castable, and the thermal shock stability index deteriorates.
Low Cement Castable
Low Cement Castable

Low Cement Castables Properties

In view of the problem of poor high temperature performance of ordinary refractory castables, low cement refractory castables effectively avoid the regret of high temperature performance. The low-cement refractory castable, often mentioned, has a cement content of less than 8%, while less than 4% is called an ultra-low cement refractory castable.

In contrast, the deficiencies described above for conventional refractory castables translate into the advantages of low cement refractory castables. Its structure is dense. The apparent porosity is low, the refractoriness is high, the load softening temperature is high, the high temperature strength is high, and the thermal shock stability is good. However, due to its low cement content, the condensation time is long, and the early strength is low, which is particularly unfavorable in winter and low temperature conditions. Therefore, pay full attention when construction lining.

Low Cement Wear Resistant Castable
Low Cement Wear Resistant Castable

Casting Refractory Cement Manufacturer

As a manufacturer of refractory materials, Rongsheng is committed to the production and development of refractory bricks and refractory castables. It is designed to provide customers with refractory castable products that meet the needs of customers’ thermal equipment. Our casting refractory cement with low cement Can also help you more. Email to Us for free quote.

Steel Fiber Reinforced High Alumina Castables

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Steel fiber reinforced refractory castable, is the refractory castable made of refractory aggregate, powder, binder, admixture and steel fiber (heat resistant stainless steel fiber, generally 0.6%~2.5%). It has the characteristics of high strength, wear resistance and thermal shock resistance. Applicable to masonry at high temperatures with mechanical vibration, thermal shock, wear and other parts.

Steel Fiber Reinforced High Alumina Castables
Steel Fiber Reinforced High Alumina Castables

Steel Fiber Reinforced Refractory Castable Application

It is widely used in the steel, metallurgy, chemical and building materials industries in boilers and furnace outlets, tops, side walls, etc.; in CFB boilers, it is often used in furnace outlets and side walls, top, cyclone separators. , cyclone separator top, return feeder and other parts.

Theoretical basis for steel fiber reinforcement

For general refractory materials, they are not wear-resistant during use, have poor seismic resistance, and are prone to cracking and crushing at high temperatures. The addition of steel fiber can greatly improve the strength and the cracking of the structure, thereby achieving the purpose of prolonging the service life of the furnace. The addition of steel fibers to the amorphous refractory material results in a significant improvement in refractory properties.

The main features of steel fiber as a refractory reinforcement

(1) The strength of steel fiber is very high. According to the composite material rule, the toughness, crack resistance and peeling resistance of steel fiber after adding steel fiber increase, which is beneficial to the overall improvement of tensile strength and bending strength of refractory material.

(2) In the steel fiber reinforced refractory material, since the steel fiber is present as a crack arresting expansion, it is intended to prepare a gradual expansion process of the microcrack generated in the refractory material under the action of thermal stress and mechanical stress.

(3) Due to the action of the steel fiber in the refractory material, even in the case of cracking of the refractory material, it can be carried, thereby improving the fracture work of the refractory material and finally increasing the plasticity of the refractory material. The fracture work of the steel fiber refractory is more than several times greater than that of the steel fiber refractory. Therefore, the steel fiber increases the shock resistance and mechanical shock resistance of the refractory material.

Compared with non-reinforced refractory castables, heat-resistant steel fiber reinforced high-aluminum castables have excellent toughness, high strength, good impact resistance and thermal shock resistance. They can be used in key areas to significantly improve the performance of refractory castables. Extend the service life of refractory products.

The use of steel fiber reinforced high-aluminum castables can reduce the number of furnace inspections, save refractory materials, and reduce furnace costs and furnace fuel. At the same time, the operating rate of the kiln was increased, the production time was increased, the output was increased, and obvious economic benefits were obtained.

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